US4043903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for promotion of algae growth in a sewage medium
Assignee: Individual
•
Filing: 1975-10-28
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Granted: 1977-08-23
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Expires: 1995-10-28
Abstract
Abstract An improved method for promoting algae growth in a sewage medium is disclosed. A high density algae culture can be obtained in a sewage water treatment process by placing algae in pure water separated by a dialysis membrane from sewage water wherein osmotic interaction occurs across the membrane. In a preferred embodiment algae is placed in pure water in dialysis tubing and the tubing is suspended in the presence of light in sewage water for osmotic interaction therewith.
Inventors
- 👤 Inka Dor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:26
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/24; B01D61/243; A; A01; A01G; A01G33/00; B01D63/00; B01D63/06; C; C02; C02F; C02F3/00; C02F3/32; C12; C12M; C12M21/00; C12M21/02; C12M29/00; C12M29/04; C12M41/00; C12M41/06; Y; Y02; Y02A; Y02A40/00; Y02A40/80
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
An improved method for promoting algae growth in sewage medium comprising placing algae in pure water separated by a dialysis membrane from sewage water in the presence of light of an intensity of at least about 15,000 lux and allowing osmotic interaction to occur across said membrane as a result of the difference in concentration gradient, wherein said dialysis membrane has a porosity in the range of about 250A to 24A.
Claim 2
Dependent Claim
71 words
An improved method for promoting algae growth in sewage medium comprising placing algae in pure water separated by a dialysis membrane from sewage water in the presence of light of an intensity of at least about 15,000 lux and allowing osmotic interaction to occur across said membrane as a result of the difference in concentration gradient, wherein said dialysis membrane has a porosity in the range of about 250A to 24A.
Claim 3
Dependent Claim
38 words
The improved method of promoting algae growth in sewage medium of claim 1, further comprising placing algae containing water in dialysis tubing and suspending said tubing in the presence of light in sewage water for osmotic interaction therewith.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |